• 18기 북클럽

    • 방장 : 미르나래
    • 대상 : 중학생
    • 도서수준 : 고전 & 과학

    고전과 과학을 함께 (중학생이 운영하는 북클럽입니다)

  
[18]Electricity and Magnetism 7차 미션

글쓴이 미르나래

등록일 2013-12-21 23:01

조회수 1,819

http://www.suksuk.co.kr/momboard/CAX_090/5517

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Q1. In page 87  there are claims that magnets can heal people. Do you think this is possible?

 

Q2. If you wanted a motor to go without the magenet's pole switching, what would you do?

 

Q3. If you did the experiment on page 98 and the compass needle turned 45 degrees, can you guess how strong the magnetic force you made is?

 

 

 

 

 

 

To be answered by 1/5 after reading chap3.1~3.4(76~111p)


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directioner 2013-12-29 20:42 

A1. Well, I think yes, it's possible. If you look at claim 'e', you can see that not only people with real magnets in their heels reported improvements, but also the same amount of the people with fake magnets reported improvements. But, still, I think that thinking magnets can heal people is not just because of the plecebo effect. I heard that magnet's north polar is like the negative charge, so it can help the circulation of the blood. And, the magnetic field is distributed in people's body, too. Most of the activity of life is connected to the electrical phenomenon, so many scientists guess that magnets can be used to heal certain sickness such as cancer, dementia, stroke etc. So I think that magnet can heal people in someway.

A2. Well, all motors have main parts. Magnet, voltage source, a shaft and an eletromagnet. I think the most important partr of the motor is noneother than the magnet and the elctromagnet. When current from the voltage source flows through the coil, the poles of the magnet interact with the poles of the electromagnet which causes the motor to turn and on and on. Sorry, but I have no idea how to make a motor go without the magnet's pole switching. I think that motor can't work without an electromagnet, but because of the electromagnet, the motor work, switching the magnet's pole.

A3. Well, I think it depends of how much the strong the batery is or how long the wire is. I don't know how to measure the magnetic force, but since the needle  of the compass turned 45 degrees, and if we say that the limit of the magnetic force we can made is 1, then the magnetic force that I made will be 1/8? I don't know the answer exactly, sorry.

Erin37 2013-12-25 20:08 

1. It was theorized that a magnet can draw iron, and blood contains iron, so the magnet can draw blood too. But I think it is impossible. To control blood doesn't mean that you can heal people. And if it is possible, it is not possible today. It is just a theory.

2. The magnet needs to rotate to work the motor. And the poles have to be the same to react to each other, so it can turn again. I think if you change the way the current is flowing, it can work the same way.

3. I think it depends on the battery you are using the stronger the battery, the more the needle would turn.

빛나는지 2013-12-23 00:21 

1. Well, first of all, there are so many experiments about this theme, and the results vary. Some results say it is just the placebo effect, and some say it is more than the placebo effect. The claim that magnets help "circulate blood" is a common one among supporters of magnet therapy, but there is no scientific evidence that magnets do anything to the blood. Some claim magnets affect the iron in red blood cells, and others claim that magnets create an alkaline reaction in the body. There were also researches about the correlations between electromagnetic radiation and cancer rates.

2.The constantly switching AC current changes the polarity, it reverses direction of the electric charge at regular intervals. The DC motor is a little backward because it needs a way to switch the field polarity. If you connect an electromagnet coil to an AC power source, it'll automatically switch field polarity. If you connect the electromagnet to a DC source, you'll have to switch the current from positive to negative and back to obtain the same effect.

3. I don't have any idea of how I can know how strong the magnetic force is only knowing the angle that the compass needle turned.


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